refactor(cordova/apple): use standard folder naming in Swift package

[fortuna]

If the folder matches the target name, we don't need to specify the source path

[sbruens]

Nice.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c908e1a) 36% compared to head (f163fc5) 36%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1679   +/-   ##
======================================
  Coverage      36%     36%           
======================================
  Files          45      45           
  Lines        2756    2756           
  Branches      312     312           
======================================
  Hits         1006    1006           
  Misses       1750    1750           

Flag	Coverage Δ
apple	14% <ø> (ø)
ios	15% <ø> (ø)
macos	14% <ø> (ø)
unittests	36% <ø> (ø)
www	45% <ø> (ø)

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Files Changed	Coverage Δ
...AppleLib/Sources/OutlineTunnel/OutlineTunnel.swift	67% <ø> (ø)
...Lib/Sources/OutlineTunnel/OutlineTunnelStore.swift	29% <ø> (ø)
...ineAppleLib/Sources/OutlineTunnel/OutlineVpn.swift	0% <ø> (ø)
...OutlineAppleLib/Sources/OutlineTunnel/Subnet.swift	84% <ø> (ø)
...ources/PacketTunnelProvider/PacketTunnelProvider.m	0% <ø> (ø)

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